linux-kernel - Re: [PATCH] hfs: export dbg

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Message-ID: <e87e0fce1391a34ccd3f62581f8dc62d03b5c022.camel@dubeyko.com>
Date: Fri, 09 May 2025 10:39:12 -0700
From: Viacheslav Dubeyko <slava@...eyko.com>
To: Yangtao Li <frank.li@...o.com>, glaubitz@...sik.fu-berlin.de
Cc: linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] hfs: export dbg_flags in debugfs

Hi Yangtao,

On Wed, 2025-05-07 at 08:55 -0600, Yangtao Li wrote:
> hfs currently has some function tracking points,
> which are helpful for problem analysis, but rely on
> modifying the DBG_MASK macro.
> 
> Modifying the macro requires recompiling the kernel,
> and the control of the log is more troublesome.
> 
> Let's export this debug facility to debugfs so that
> it can be easily controlled through the node.
> 
> node:
> 	/sys/kernel/debug/hfs/dbg_flags
> 
> for_each_bit:
> 
> 	DBG_BNODE_REFS  0x00000001
> 	DBG_BNODE_MOD   0x00000002
> 	DBG_CAT_MOD     0x00000004
> 	DBG_INODE       0x00000008
> 	DBG_SUPER       0x00000010
> 	DBG_EXTENT      0x00000020
> 	DBG_BITMAP      0x00000040
> 

Frankly speaking, if we would like to rework the debugging framework in
HFS/HFS+, then I prefer to switch on pr_debug() and to use dynamic
debug framework of Linux kernel [1]. It will provide the more flexible
solution.

Thanks,
Slava.

[1] https://www.kernel.org/doc/html/v4.14/admin-guide/dynamic-debug-howto.html